import { useState, useEffect } from "react";
import { Bell, X } from "lucide-react";
import { Button } from "@/components/ui/button";
import { useToast } from "@/hooks/use-toast";
import { isPushSupported, getExistingSubscription, subscribeToPush } from "@/lib/push-utils";

const DISMISS_KEY = "folx-push-prompt-dismissed";
const DISMISS_DAYS = 7;

export default function PushPromptBanner() {
  const [visible, setVisible] = useState(false);
  const { toast } = useToast();

  useEffect(() => {
    if (!isPushSupported()) return;
    if (Notification.permission === "denied") return;

    const dismissedAt = localStorage.getItem(DISMISS_KEY);
    if (dismissedAt) {
      const elapsed = Date.now() - parseInt(dismissedAt, 10);
      if (elapsed < DISMISS_DAYS * 24 * 60 * 60 * 1000) return;
    }

    const timer = setTimeout(async () => {
      const sub = await getExistingSubscription();
      if (!sub) setVisible(true);
    }, 5000);

    return () => clearTimeout(timer);
  }, []);

  const dismiss = () => {
    setVisible(false);
    localStorage.setItem(DISMISS_KEY, Date.now().toString());
  };

  const accept = async () => {
    dismiss();
    try {
      await subscribeToPush();
      toast({ title: "Benachrichtigungen aktiviert", description: "Sie werden über neue Inhalte informiert." });
    } catch (err) {
      if (Notification.permission === "denied") {
        toast({ title: "Benachrichtigungen blockiert", description: "Bitte erlauben Sie Benachrichtigungen in Ihren Browsereinstellungen.", variant: "destructive" });
      } else {
        console.error("Push subscription error:", err);
        toast({ title: "Fehler", description: "Benachrichtigungen konnten nicht aktiviert werden. Bitte versuchen Sie es später erneut.", variant: "destructive" });
      }
    }
  };

  if (!visible) return null;

  return (
    <div className="fixed bottom-4 left-4 right-4 md:left-auto md:right-6 md:max-w-sm z-50 animate-in slide-in-from-bottom-4 fade-in duration-500 pointer-events-none" data-testid="push-prompt-banner">
      <div className="bg-card border border-card-border rounded-xl shadow-2xl p-3 sm:p-4 pointer-events-auto">
        <div className="flex items-start gap-3">
          <div className="flex-shrink-0 w-10 h-10 rounded-full bg-primary/10 flex items-center justify-center">
            <Bell className="w-5 h-5 text-primary" />
          </div>
          <div className="flex-1 min-w-0">
            <p className="font-semibold text-foreground text-sm" data-testid="text-push-prompt-title">
              Nichts mehr verpassen!
            </p>
            <p className="text-xs text-muted-foreground mt-1">
              Erhalten Sie Benachrichtigungen über neue Artikel und Videos von FOLX TV.
            </p>
            <div className="flex items-center gap-2 mt-3">
              <Button
                size="sm"
                onClick={accept}
                className="text-xs h-8"
                data-testid="button-push-prompt-accept"
              >
                Ja, gerne!
              </Button>
              <Button
                variant="ghost"
                size="sm"
                onClick={dismiss}
                className="text-xs h-8 text-muted-foreground"
                data-testid="button-push-prompt-dismiss"
              >
                Nein, danke
              </Button>
            </div>
          </div>
          <button
            onClick={dismiss}
            className="text-muted-foreground hover:text-foreground transition-colors"
            data-testid="button-push-prompt-close"
          >
            <X className="w-4 h-4" />
          </button>
        </div>
      </div>
    </div>
  );
}